After registering at http://pusher.com configure your app with the security credentials

Pusher.app_id = 'your-pusher-app-id'
Pusher.key = 'your-pusher-key'
Pusher.secret = 'your-pusher-secret'

Trigger an event with {Pusher::Channel#trigger!}

Pusher['a_channel'].trigger!('an_event', {:some => 'data'})

Handle errors by rescuing Pusher::Error (all Pusher errors are descendants of this error)

begin
  Pusher['a_channel'].trigger!('an_event', {:some => 'data'})
rescue Pusher::Error => e
  # (Pusher::AuthenticationError, Pusher::HTTPError, or Pusher::Error)
end

Optionally a socket id may be provided. This will exclude the event from being triggered on this socket id (see http://pusher.com/docs/publisher_api_guide/publisher_excluding_recipients for more info).

Pusher['a_channel'].trigger!('an_event', {:some => 'data'}, socket_id)

If you don't need to handle failure cases, then you can simply use the {Pusher::Channel#trigger} method, which will rescue and log any errors for you

Pusher['a_channel'].trigger('an_event', {:some => 'data'})

Errors are logged to Pusher.logger. It will by default use Logger from stdlib, however you can assign any logger:

Pusher.logger = Rails.logger

To avoid blocking in a typical web application, you may wish to use the {Pusher::Channel#trigger_async} method which makes asynchronous API requests. trigger_async returns a deferrable which you can optionally bind to with success and failure callbacks.

You need to be running eventmachine to make use of this functionality. This is already the case if, for example, you're deploying to Heroku or using the Thin web server. You will also need to add em-http-request to your Gemfile.

$ gem install em-http-request

deferrable = Pusher['a_channel'].trigger_async('an_event', {
  :some => 'data'
}, socket_id)
deferrable.callback {
  # Do something on success
}
deferrable.errback { |error|
  # error is a instance of Pusher::Error
}

The Pusher Gem also deals with signing requests for authenticated private channels. A quick Rails controller example:

reponse = Pusher['private-my_channel'].authenticate(params[:socket_id])
render :json => response

Read more about private channels in the docs and under {Pusher::Channel#authenticate}.

Use bundler in order to run specs with the correct dependencies.

bundle
bundle exec rspec spec/*_spec.rb

Copyright (c) 2010 New Bamboo. See LICENSE for details.